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Finding the Fourth Proportional to 1,661.64, 2,491.72 and 621.46

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Solution

The fourth proportional to 1,661.64, 2,491.72 and 621.46 is: 931.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.64 : 2,491.72 = 621.46 : x
  2. Step 2: Convert to fraction form
    1,661.64/2,491.72 = 621.46/x
  3. Step 3: Cross multiply
    1,661.64x = 2,491.72 × 621.46
  4. Step 4: Simplify right side
    1,661.64x = 1,548,504.31
  5. Step 5: Solve for x
    x = 1,548,504.31/1,661.64
  6. Step 6: Final answer
    x = 931.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.